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JAMES E; ATWOOD, OF TRENTON, NEW JERSEY, SSIGNOR T() HIMSELF' AND CYRUS H. IVICCORIVIICK,` OF NEW YORK CITY.

Letters Patent No. 70,680, dated November 12, 1867. i I

IMPROVEMENT INISAWS.

To ALL WHoM 1T MAY ooNcERN:

Be it known that I, JAMES E. ATWOOD, of Trenton, inthe county of Mercer, Vin the State 'of New Jersey, have invented a new and useful Mode of Preventing Saw-Teeth from Turning Back; and I do hereby declare that the following is a full and exactdescription thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The nature of my invention consists in inserting a movable saw-tooth in such a manner as to have but very little strain upon the plate, and held in its place by means of a ratchet.

Figure l is a view ofthe tooth with ratchet attached.

Figure 2 is a perspective view.

Letter A is a quarter-moon-shaped tooth; letters 'c c c is Athe ratchet. Letter A, in g. 2, is the tooth .when inserted; letters c c c are the ratchet, notches, or coge; letters B B are the saw-plate.- I construct tooth A in a quarter-moon shape, ofthe best cast steel, as shown by fig. 1. Ratchet c 'c c is made by tiling, or rnay be done by swaging. 'The cavity or insertion is out into plate B, so that the opening is at an angle of about -fortyive degrees. The ratchet or notches in plate B are led in at the lower side 'of the insertion at ccc. The use or advantage of said ratchet is to prevent the tooth from turning when it strikes a knot; also when the point of the tooth is worn short I turn the .tooth out one notch ofthe ratchet -c c c until the toothis worn out.

The advantage of my invention is as follows: first, it has. more room for the saw-dust; second, it is held in the plate without strainingthe same; third, its position is such that the cutting point cuts and does not scrape, as when the insertion is open at the top.

I do not claim circular lines or round insertions, but what I do claim as my improvement, and desire to secure by Letters Patent, is

The tooth A, when -held in its position by ratchet c -c =c, for the apurpose herein described.

JAMES E. ATWOOD. Witnesses:

JAMES Rocas,

W. R. Sciioomrl` 

